LibWeb: Parse and compute CSS quotes property

Author: https://github.com/AtkinsSJ
Commit: dc7a52957e
Pull-request: https://github.com/SerenityOS/serenity/pull/21046
Reviewed-by: https://github.com/ADKaster ✅

Userland/Libraries/LibWeb/CSS/StyleProperties.h

@@ -146,6 +146,8 @@ public:
     void set_math_depth(int math_depth);
     int math_depth() const { return m_math_depth; }
 
+    QuotesData quotes() const;
+
     static NonnullRefPtr<Gfx::Font const> font_fallback(bool monospace, bool bold);
 
 private: